hey every one. i have a 1987 Toyota 4 runner with a 22re motor. the misfire will get even worse at 3 thousand rpm and up. i have replaced every thing from the rotor to the spark plugs 3 months ago. and i have checked resistance ratings for the coil and pick up coil and i have checked the injectors and cleaned them. i also checked compression on all cylinders they are with in 2 psi of each other. no plugs are fouled they are all the perfect color and i also pulled each plug wire off to see if it would change the idle. also did a fuel pressure test its within specs. so if any one has an idea it would be GREATLY appreciated.

 

Have you checked the timming ?, and also check for vacuum leaks.

 

timing is good and no vacuum leaks but while i was checking that a friend told me to check my valve springs and they were bad what can you expect with 245 k miles. thanks

 

Check your injector harness near the EGR valve a friend had a bad missfire/stumble & had it to several shops they cleaned his injectors twice, plugs, cap, rotor & it kept coming back he was thinking possible TPS problem . He brought it to me & I searched the post's here & found one where someone had found the injector harness melted thru where it had been contacting the pipe on the EGR I checked this & sure enough it was rubbing & melted thru repaired it & problem solved. This was on a 89 22re in a pickup.